Workshop Technology - Study Mode

[#91] In arc welding, the electric arc is produced between the work and the electrode by
Correct Answer

(D) All of these

Explanation

Solution: Arc welding is a fusion welding process where heat is generated to melt and join metals. The electric arc is created between the electrode and the workpiece, which produces intense heat. Voltage is responsible for initiating and maintaining the arc gap between the electrode and the workpiece. Flow of current provides the energy required to sustain the arc and generate heat for melting the metal. Contact resistance at the point of initial contact helps in momentarily generating heat, which assists in the arc initiation. Therefore, all these factors — voltage, current flow, and contact resistance — contribute to producing the electric arc in arc welding. Hence, the correct answer is Option D: All of these.

[#92] A file removes the metal during
Correct Answer

(A) Forward stroke

Explanation

Solution: A file removes the metal during Forward stroke

[#93] Lancing is the operation of
Correct Answer

(C) Cutting a sheet of metal through part of its length and then bending the cut portion

Explanation

Solution: Lancing is the operation of Cutting a sheet of metal through part of its length and then bending the cut portion.

[#94] Notching is the operation of
Correct Answer

(B) Removal of metal to the desired shape from the edge of a plate

Explanation

Solution: Notching is the operation of Removal of metal to the desired shape from the edge of a plate

[#95] When the dimension is expressed as $$20_{ - 0.025}^{ + 0.035},$$ xa0then the tolerance is
Correct Answer

(D) 0.06 mm

Explanation

Solution: Upper Limit = 20.000 + 0.035 = 20.035 Lower limit = 20.000 - 0.025 = 19.975 Tolerance = Upper Limit - Lower limit = 20.035 - 19.975 = 0.06